Noise suppression drilling system
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United States of America Patent
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Aug 6, 2002
Issued Date -
N/A
app pub date -
Dec 19, 2000
filing date -
Jun 7, 1995
priority date (Note) -
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Abstract
The invention encompasses improvements in noise attenuation systems for reducing the audible noise level generated during earth boring operations using a hard surfaced rotary drill bit, and in dual bore-cutting elements for performing sequential first and second bore cutting to the design bore-gauge.
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